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采用PAR-80型冠层仪对紫花苜蓿冠层各分量进行观测,研究了入射PAR、紫花苜蓿冠层的反射PAR、透过紫花苜蓿冠层到达地表的PAR、地表反射的PAR的日变化情况。根据冠层中各分量计算作物冠层吸收的辐射比例f,得出紫花苜蓿从抽苔分枝期到成熟期(f)和叶面积指数(LA I)之间有很好的线性关系,并建立干物质生产模型。
The PAR-80 canopy instrument was used to measure the canopy components of alfalfa. The daily PAR changes of PAR, PAR of alfalfa canopy, PAR of alfalfa canopy, PAR of surface reflectance through alfalfa canopy were studied. . Based on the components of the canopy, the radiation ratio f of the crop canopy was calculated. The results showed that there was a good linear relationship between alfalfa’s branching to maturity (f) and leaf area index (LAI) Establish a dry matter production model.